Added bijective time-string to time conversion to SimoxUtility

SimoxUtility/algorithm/string/string_tools.cpp

@@ -176,6 +176,25 @@ bool alg::contains(const std::string& haystack, const std::string& needle)
     return boost::algorithm::contains(haystack, needle);
 }
 
+time_t alg::to_time_t(const std::string &time, const std::string &time_format)
+{
+    std::tm tm = {};
+    std::istringstream ss(time);
+    ss.imbue(std::locale());
+    ss >> std::get_time(&tm, time_format.c_str());
+    if (ss.fail())
+        throw error::SimoxError("Failed converting string '" + time + "' to time with time format " + time_format);
+    else return mktime(&tm);
+}
+
+std::string alg::to_string(time_t t, const std::string &time_format)
+{
+    char mbstr[100];
+    std::strftime(mbstr, 100, time_format.c_str(), std::localtime(&t));
+    return std::string(mbstr);
+}
+
+
 unsigned long alg::count(const std::string& input, const std::string& search)
 {
     auto start = 0U;

SimoxUtility/algorithm/string/string_tools.h

@@ -144,4 +144,8 @@ namespace simox::alg
     {
         return multi_to_string(vector.begin(), vector.end());
     }
+
+    time_t to_time_t(const std::string &time, const std::string &time_format);
+
+    std::string to_string(time_t t, const std::string &time_format);
 }

SimoxUtility/tests/algorithm/string_tools.cpp

@@ -102,6 +102,13 @@ BOOST_AUTO_TEST_CASE(capitalize_words)
     BOOST_CHECK_EQUAL_COLLECTIONS(out.begin(), out.end(), ex.begin(), ex.end());
 }
 
+BOOST_AUTO_TEST_CASE(time_conversion)
+{
+    std::string timeString = "2021-01-12";
+    std::string timeFormat = "%Y-%m-%d";
+    time_t time = simox::alg::to_time_t(timeString, timeFormat);
+    BOOST_CHECK_EQUAL(simox::alg::to_string(time, timeFormat), timeString);
+}
 
 BOOST_AUTO_TEST_CASE(remove_prefix_suffix)
 {